Gets or sets a value indicating whether the current menu item is selected in a System.Web.UI.WebControls.Menu control.
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Use the MenuItem.Selected property to specify or determine whether the current menu item is selected.
Although the property can be used to determine whether a menu item is selected, it is more common to use the Menu.SelectedItem property.
Only one menu item can be selected at a time in the System.Web.UI.WebControls.Menu control.